[jira] [Created] (SPARK-24125) Add quoting rules to SQL guide

["Henry Robinson (JIRA)" <ji...@apache.org>]

Henry Robinson created SPARK-24125:
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             Summary: Add quoting rules to SQL guide
                 Key: SPARK-24125
                 URL: https://issues.apache.org/jira/browse/SPARK-24125
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Henry Robinson


As far as I can tell, Spark SQL's quoting rules are as follows:

* {{`foo bar`}} is an identifier
* {{'foo bar'}} is a string literal
* {{"foo bar"}} is a string literal

The last of these is non-standard (usually {{"foo bar"}} is an identifier), and so it's probably worth mentioning these rules in the 'reference' section of the [SQL guide|http://spark.apache.org/docs/latest/sql-programming-guide.html#reference].

I'm assuming there's not a lot of enthusiasm to change the quoting rules, given it would be a breaking change, and that backticks work just fine as an alternative. 



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